TERROR: Fabio Pocas, now known as Abdurahman Al Andalus, disappeared before these photos of him surfaced online [FACEBOOK]

Security chiefs are probing if the east London gang of soccer starlets – one of whom claims to have trained with Arsenal – were involved in making the horrific execution videos which shocked the world.

Spooks believe they may lead authorities straight to black-robed killer 'John' who is wanted for the murders of at least five hostages.

Last night the dad of a possible sixth victim – Japanese hostage Haruna Yukawa – was overwhelmed with grief after another video appearing to show an image of his son's beheaded corpse appeared online.

Last week Jihadi John gave the Japanese government 72 hours to pay a £130million ransom or vowed he would kill military company operator Yukawa, 42, and fellow countryman Kenji Goto.

“I hope he's still alive. If he'd got a trial he wouldn't be there now. It's unbelievable”

Ewemade Orobator

Over the weekend journalist Goto, 47, appeared on film holding a picture of his executed pal - and warned he too will be killed unless Iraqi terrorist Sajida al Rishawi is released.

And as the world reeled from the latest terror vid, Brit spooks were desperately probing the football gang feared to have become involved in the brutality.

The five jihadists from Leyton and Walthamstow are Portuguese immigrants who converted to Islam and were radicalised in London before deciding to wage holy war abroad.

They are all said to be talented footballers with one having reportedly starred in Portuguese side Sporting Lisbon's youth team.

In July 2014 — 39 days before American hostage James Foley, 40, became the first hostage executed—one of the group's ringleaders posted a Twitter message suggesting he had advance knowledge of the journalist's fate.

Nero Saraiva, 28, tweeted: "Message to America, the Islamic State is making a new movie. Thank u for the actors.”

RISING STAR: Fabio Pocas, circled, was a talented football player [DS]

IS revealed Foley's beheading in a YouTube film called A Message To America.

Saraiva'a mob came separately to London but - according to Expresso newspaper in Lisbon - some shared a flat in Leyton.

They were passionate about football, having shown promise as youngsters, and regularly met to watch televised matches at a Portuguese-run cafe in east London.

Fabio Pocas, 22, moved to the UK three years ago in a bid to become a professional footballer.